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  #1  
Old 07-14-2009, 03:43 PM
chris66 chris66 is offline
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Default Replacing rear end gears

As I had mentioned in a previous thread, I am a bit unhappy with the way the rear end feels while towing. Somebody blamed it on the hitch equalizer, some others said that is the coil springs and suggested installing some air bags, somebody even suggested upgrading to a 3.92 gear ratio (currently 3.55)
Well, I have contacted the dealership and inquired about the cost of the procedure and was quoted around 4160$ (CAD) with about 2600$ going into parts. I was told I have to do the front differential as well since I have a 4x4 (cannot have two different gear ratios). Seems a bit to much compared to the 525$ upgrade cost from a 3.55 to a 3.92 gear ratio rear axle (www.dodge.ca and build your vehicle).

Has anyone did this before or has any experience with this? Is it such a big difference in towing between a 3.55 and a 3.92 that would justify that kind of money?

Thanks for your help
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  #2  
Old 07-14-2009, 04:18 PM
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NEVRL8 NEVRL8 is offline
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I had a 2006 Chevy Avalance 4X4 before my Ram. It cost me $1200 total parts and labor to have the dealership change front and rear diffs from 3:42 to 4:10 gears. Although it was a noticable change is was not worth the money spent. Also if not shimed correctly you can have slack in your gears or they could be too tight, causing other problems. Just not worth it to me. I have 3:55 in my crewcab and like em'
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  #3  
Old 07-14-2009, 07:10 PM
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Mcguinness Mcguinness is offline
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yeah stick with the 3.55, before i just recently bought mine i had the chance to drive both the 3.55 and the 3.92 and all be it there's a difference it's not worth that amount.
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Old 07-15-2009, 10:20 PM
jessman02 jessman02 is offline
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Default

Hey, just reading your post, do you not have tow haul, on your truck,if you want to lower the rearend ratio you can do this by going to smaller tire which
will lower the rear end ratio, also you can raise the ratio by going with taller tires,just something for you to think about,and a lot cheaper, jessman
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  #5  
Old 09-15-2009, 04:29 PM
Dodger D Dodger D is offline
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I've done a lot of research on this subject. My 2009 slt qc 4x4 came with the 3.55 axle ratio and 20" wheels, not a great configuration for towing... Here are the specs:
Tire size Engine Axle Ratio Max Trailer Wgt.
20"275 5.7L 3.55 6450 (As configured)
20"275 " 3.92 7450 ($1800 @speclty shop, $2.5-3K by dealer)
17"265 " 3.55 7500 ($400-$1000 on Craigs List)
17"265 " 3.92 8500 ($2200-$4000 combined) *BEST
I want to tow a trailer with a Max Wgt of 7300lbs, so my truck will come within spec with any of the above options. The best idea would be to change out both tires and the axle ratio and have plenty of pulling-power, but the most cost effective choice would be to just get a separate set of five 17"265 wheels&tires. My thoughts are to have the smaller towing set available when I tow the trailer and the bigger set for typical daily use. There are a few problems with this scenario:
1. Swapping out tires&wheels from time-to-time. (Not too bad, I have the air tools for the job including jacks and stands. Changing out the spare would be required as well, but not overwhelming... And I would either have to live with the 4mph @ 60mph variance, or go to the dealer to have the setting changed back and forth (a big hassle), or apparently there is a tool I can purchase to accomplish this for approx. $300 and do it myself. All this will take time of course with torquing and all, and of course how many times a month, year, etc. I would do this is questionable at this time....
2. There may be a legality issue with doing this. The sticker on the door of the truck says that the wheels and tires specified are the 20"275's and the GAWR is 6700lbs. If I was to cause an accident towing the 7300# trailer with this vehicle, the State Patrol could cite me for being out of configuration and my insurance company could decline coverage as well. I am trying to get an answer from the DMV, but they say I have to talk to the State Patrol and my have to get the change inspected and permitted to be legal.....

Anyway, this is all a huge hassle! Has anyone else been through this? Any other thoughts? Dodger D (PS. There is one more option and that is to swap out my truck for one that is configured to tow better - I don't even want to think of that, but it could be the best choice of all...)
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  #6  
Old 09-16-2009, 10:36 AM
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smartel smartel is offline
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I am very unhappy with the 3.55's (without anti-spin). My 05 Ram had 3.92's with anti-spin diff.
When I bought my 09, it said nothing on the sticker about what diff/gears were installed. I asked the salesman about it and he said (it's a loaded truck) that it definately had 3.92's and anti-spin.
After having the truck for a week and towing a 4000lb load, it didn't feel right. I crawled under to look at the sticker on the axle and saw that it has 3.55's. Then I did a burn-out and saw the single line and got very angry.
Went back to the dealership and explained the situation to the sales manager and the best offer he could give me was that he'd have the on-site mechanics change the gears/diff out to the 3.92/anti-spin set-up and deduct the $525 option price from the total and it would then cost me around $1300.00.
So you can imagine what I told him....
Anyways, I've decided that I will stick with the 3.55's but will have a POWER-TRAX limited slip installed for around $850.00.
I can live with the 3.55's but I can't live without the limited slip.
Towing a trailer on wet pavement sucks! ONE Wheel Wonder spins entirely too much when starting off from a stop.
It actually makes me wish I'd kept my 05! It was a beast! Great towing, Great off-the-line acceleration. With Superchips tuner, K&N filter, Flowmaster exhaust, and about 400lbs of tools in the toolbox, I ran a best 1/4 mile of 14.72! That's quick for a qc truck!

But as soon as I've gotten the wife to let me spend the money (on a brand new truck) LOL, I'll post my thoughts on the POWER-TRAX set-up!
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  #7  
Old 09-16-2009, 09:28 PM
Dodger D Dodger D is offline
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Well, I finally figured it out. I can swap out the 20's for 17's, no problem. The State Patrol said they would refer to the Dodge towing specs with the tires on the vehicle in the event of an accident. And, Chrysler Corp. says the tire/wheel swap will not affect the warrenty. I am working with my dealer on a wheel/tire swap which should be a wash and the the speedo change will be made permanent. This puts me into spec with a 13000lb GCWR (Gross Combined Weight Rating) and my Max Trailer Weight @ 7500lbs. I realize there will be a small loss in mileage when not towing, but it will be minimal.

Cheers, DD
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  #8  
Old 09-26-2010, 11:14 PM
mhennigar mhennigar is offline
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Default 2004 Ram 1500 4X4 Quad Cab rearend issues

Hello:
I am new to this forum. Just signed up today. Just bought a used '04 ram hemi and found I have a blown diff. Can anyone direct me to a website where I can find step-by-step instructions on changing this out, or is it a job I should be attempting?
thank you
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  #9  
Old 09-27-2010, 12:13 AM
RootBeer RootBeer is offline
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Welcome to the Z. Best bet I've ever found is to go to the local parts store and buy a Chilton's manual or Hynes for your vehicle. That way you have it right in front of you when doing the work.
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  #10  
Old 09-27-2010, 12:21 AM
smokinjoe72 smokinjoe72 is offline
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I am going to change out my diff very soon. My '10 came with 3.21 and I tow 7K lbs. The best way is purchase the carrier, no clearances to set. Just pull the axles and install.

Used carriers are about $600 rear. Front carriers are even cheaper.

Anyone have thoughts on if the 4.10s are the way to go or will my MPG suffer when not towing (only tow one weekend p/mth).

FYI, I towed with the 3.21s and it was just brutal - as I knew it would be. 8.1 mpg
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